vsavkin

class Book
  include DataMapper::Resource

  property :id, Serial
  property :title, String
  property :author, String
  property :price, Decimal
end

class User

vsavkin

class Order
  include DataMapper::Resource

  property :id, Serial, key: true
  property :status, Enum[:new, :ready, :paid, :shipped, :closed, :canceled]

  belongs_to :buyer, 'User'
  has n, :items
  has 1, :payment

vsavkin

buyer = current_user
order = Order.make buyer

#At this moment: 
#order.shipping_address == buyers_address
#order.status == :new

order.make_item book1, 2
order.make_item book2, 3
order.mark_as_ready

vsavkin

order = Order.get(buyer, params[:id])

vsavkin

@all_orders = current_user.orders.active

vsavkin

@all_orders = Order.active_orders(user)

vsavkin

order = ...
stub(orders = Object.new).active {[order]}
stub(user = Object.new).orders {orders}
stub(UserSession).current_user {user}

vsavkin

order = ...
stub(UserSession).current_user {user}
stub(Order).active_orders(user){[order]}

vsavkin

class OrderPresenter < Struct.new(:order)
  def render_items
    order.items.map do |item|
      item_row item
    end.join("")
  end

  private

  def item_row item

vsavkin

module PaymentService
  def self.process order, credit_card
    with_transaction do
      order.make_payment mask_card(credit_card)
      make_remote_call credit_card, order.payment
    end
  end

  ...
end